Brake-shoe mold



Patented Feb. 19, 1924.

NTED STATES JAMES S. THOMPSON, F PELHAM, NEW YORK.

Y BRAKE-SHOE MOLD.

Application led July 20, 1923. Serial No. 652.774.

To all whom it may concern Be it known that I, JAMES S. THOMPSON, acitizen of the United States,y residing at Pelham, in the county of`Westchester and State of New York, have invented certain new and usefulImprovements in Brake- Shoe Molds, of which the following is aspecification.

This invention relates to the manufacture of brake shoes withoutchilling, and its object is broadly to facilitate the manufacture ofsuch brake shoes in permanent molds by the provision of means forpreventing any chilling effect upon the shoe casting from the metal ofthe mold, and at the same time providing a mold in which the parts to beembedded therein can be easily inserted and supported in position, andwhich can be readily and quickly opened vand closed so that the castingoperation may be speedily and economically performed.

In the accompanying drawing illustrating a selected embodiment of' theinvention- Fig. 1 is a central sectional view on the line 1-1 of Fig. 2.

l Fig. 2 shows the mold of Fig. 1 partly in elevation and partly inlongitudinal section.

Fig. 3 is a horizontal sectional view on the line 3 3 of' Fig. 2.

Referring to the drawing, the mold comprises a drag member 6 and a copecomprising a relatively fixed member 7 and a slidable member 8. The dragis hinged at 9 to the fixed member 7 of the Cope and is adapted to swingfreely down from the cope as indicated in broken lines in Fig. 1. Thecope member 8 is provided with ears 10 bored to receive the guide bars11 mounted on the fixed member 7 of the cope and projecting forward tosupport the member 8 of the cope and its sliding movement to and fromclosed position with relation to the other members of the mold. The dragmember has one or more tongues 12 which are adapted to besecured inslotted keepers 13 by removable pins 14 to hold the drag in closedposition against the cope. One or more clamping bars 15 is pivotallysecured to the fixed member 7 of the cope at 16 and carries a set screw17 at its free end to engage the slidable member of the cope for holdingthe slidable member in proper relation to the fixed member of the copeduring the casting operation. When the mold is closed the two members ofthe cope will be held rigidly clamped together and the drag member willbe held rigid in its proper rela, tion to the cope.

The parting line between the two members of' the cope extendslongitudinally of the mold and substantially central of the mold cavity18, which is formed in the construction illustrated, almost entirely inthe cope. A part of the mold cavity is located in one cope member and apart in the other cope member, and there is also an opening 19 ofsubstantial size extending through the cope and communicating with themold cavity, a part of this opening being in one member and a part inthe other member ot the cope. A sand plug 20 preferably carried by aholder 21 lits snugly in the opening 19 and it is provided with a recess22 to form the attaching lug of the shoe casting. Looped wires 23 areembedded in the sand core with their ends projecting beyond the bottomthereof to enter the mold cavity for engagement'. with the reinforcingback 24 to suspend said back and the attaching lug 25 and the core 26for formingl the open` ing within the mold cavity preliminary to closingthe mold and during the casting operation. f. support 27 or othersuitable means is engaged with the looped portions of the wire and withthe top of the plug to retain the wires in proper place.

The foregoing structure is more particularly described in my co-pendingapplica4 tion Serial No. 652,773, tiled July 20, 19253, and need not bedescribed here with greater particularity.

ln that application l have shown and oescribed a mold constructed forthe manufacture of' integral composite brake shoes having chilledsections produced by the chilling effect of' the members of the metalmold, but in this application l have slmwn a mold constructed for makingshoes without chilled sections, and for that purpose l provide all thewalls of the mold cavity with a facing of refractory material. ln thedrawing l have shown sections of refractory material set in the dragmember and in the two members of the cope, but instead of these sectionsl may apply the refractory material in the form of coating sections. Onesection 28 of refractory material on the drag member forms the bottomwall of the mold cavity and extends from end to end thereof. Twocomplementary sections 29 and 30 are arranged in the cope to form thetop, sides and end walls of the mold cavity.

Each of these sections 29 and 30jcomprises a side wall and parts of thetop Wall and both end Walls of the mold cavity. Thus the entire moldcavity is `formed by Walls of refractory material and the shoe castingis protected throughout from the 'chilling effect of the metal in themold. it some convenient place in the cope I provide a pouring gate 31..Inthe construction il-l lustrated, the sand plug has a projection 32 toengage the top of the lug 25 to prevent' the flow of metal over the topof the lug, but if rit is desired to permit the metal to tioiv over thetop of the lug, this projection may be omitted.

In practice, the mold having beenopened to discharge a casting, theslidable cope member 8 is pushed into closed relation with the copemember 7 and the clamp l5 is aps plied to secure them together. Then theplug 20 with its suspending wires 23 therein is inserted in the opening19 in the cope, the ends of the wires projecting` well down into themold cavityV and suitably spaced apart. The attaching` lng, the core forforming the opening inrsaid lug and the reinforcing back, beingassembled as a unit, are then inserted in the mold cavity through theopen bottom thereof, and the ends of the wires 23 are twisted togetherbeneath the 'reinforcing back to hold this assembled back unit in properposition for the casting operation. Then the drag member is swung up toclosed position and secured in this position by inserting the pins 14.

My invention provides a permanent mold of simple and compactconstruction which can be easily operated to produce brake shoes Withoutchilled parts. The structure of the mold is substantial and the partsare f arranged for movement in opening and closing to avoid wear of therefractory facing lay-abrasion or otherwise in the insertion of the backunit and in the discharge of the finished casting. It is of coursehighly important that the refractory facing should be preserved as longas possible without undue` wear so that shoes of uniform size and shapemay be made without Waste of material, and so that the back unit may beinserted and secured in place and the finished shoe casting dischargedwithout deformation of said facing, and this I have accomplished in ahighly satisfactory manner in my improved mold. If the shoe is notreadily discharged when the mold is open, it can be easily dislodgedWithout causing injury to the mold. If the Wires are not destroyed inthe eastingmperation, the sand plugcan be brokendovvn to permit thedischarge of the shoe, and the Wires can be removed by chiselingorwotherwisa The sand plug permits the escape of gases therethrough sothat shoes may be cast of uniform appearance, free from deformations andblowholes.

I have illustrated the invention in a selected embodiment which Ibelieve .will be readily understood by those skilledA in the art, but Ido not wish toibe restricted to the use of my invention for themanufacture of this particular type of brake shoe since it can-be usedwith satisfactory results inthe production of othershoes and othercastings, and I consider myself entitled to make all such changesinv theform, construction and arrangement partsas fairly fall Within the scopeYof the following claims.

I claim: j

l. A permanent mold for making castings, comprising a drag anda copehaving a mold cavity therein, said cope having an opening4communic/ating withsaid cavity, a sand plug in said opening, the dragbeing bodily movable away from the coperto leave the bottom of the moldYcavity open sothat the parts to be embedded in the casting may beinserted in the mold cavitythrough'the bottom thereof, means carried bysaid plug forsuspendmgisaid :partsin the mold cavity, a facing of.refractory material on the drag and cope members and forming the wallsof the mold cavity, and means for securing the members of the'mold inclosed position dun ing the casting operation. Y p I 2. A permanentmold'for nialring castings, comprising a drag member and a two-membercope having a mold cavitytherein, said cope having an openingcommunicating with said cavity,.a sand lplug in said opening, the dragmember being bodily movable away from the cope to leave the bottom ofthe mold cavity open so that the parts to be embedded in the casting maybe inserted in the mold cavity through the bottom thereof, means`carried by said plug and .projecting therefrom into thenioldl cavityfor suspending said parts in the mold cavity, refractory facingon thedrag forming the bottom wall of thermold cavity and a refractory facingon each member of the cope forming the side walls, the end Walls and thetop wall of the mold cavity, .and means for securing the members of themold in closed position during the casting operation.

minis arnoi/rrson.

